Laryngotracheitis infection
FACTS OF INFECTIOUS LARYNGOTRACHEITIS (LT) IN CHICKENS
- It’s a highly infectious disease of worldwide distribution.
- It induces significant economic losses due to high morbidity and variable mortality, drop in egg production, weight loss and susceptibility to other respiratory infections.
- The disease is caused by a Herpes viral infection characterized by latency, persistency and reversion to virulence.
- The viral infection induces chronic carrier for life, allowing the transmission to other birds and environmental contamination.
THE DIAGNOSIS CAN BE DONE BY
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CURRENT LIVE LT (CEO: CHICKEN EMBRYO ORIGIN OR TCO: TISSUE CULTURE ORIGIN) VACCINES SITUATION
These vaccines are able to provide protection but conversely, they have many side effects (Bagust 1986 and 1995, Graham 2000):
- Latent and persistent LT virus infection = chronic carrier state in vaccinated birds
- Reversion to virulence
- Transmission to other birds
- Shed into the environment
- Induce vaccine reactions that affect growth performance
There is a need for a new protective and safe LT vaccine without the limitations of the conventional live vaccines.
It is the reason why Ceva, a leader in poultry vaccines, has developed a new approach to LT vaccination with a vectored vaccine: Vectormune® FP LT.